The 2700/2800 would be slower Ballybrophy to Portlaoise so you'd lose what you gained on the branch.
One option might be to swap the 0725 Portlaoise so it departed at 0716 and did the Nenagh service's stops. How late is the Nenagh service when it hits Portlaoise? If it's more than 9 minutes then you'd have to look at whether there is scope for say skipping Cloughjordan to save an additional minute if there are no pickups being made there and maybe Birdhill too with a moving pickup of the token?
EDIT: probably not doable - I'm guessing the 0615 Heuston arr 0720 Portlaoise is where that train comes from.
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